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Thread: Ylo to Bk?

  1. #1
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    Ylo to Bk?

    Has anyone attempted hooking the first stage cooling up to the bk wire and seeing what happens when humidity setpoint is surpassed? Feel free to elaborate

  2. #2
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    What brand are you talking about.
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  3. #3
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    Guess that would be helpful, huh? It’s for a Trane gaspack with a HW IAQ 2.0.

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    Isn't BK the terminal to slow the blower?
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    It will slow the blower speed 20%, the only info I can find on it from trane is that Y2 gets hooked up to the BK wire-so it will only dehumidify on demand if your in high stage cooling(I believe that’s how it works but can’t find anything proving that). My humidity is fine during the hottest times of the days, it’s in the evenings that the humidity spikes above 50% when only Ylo is calling. My theory being it would lower Ylo blower speed 20% allowing DoD when I actually need it. I’m saving up for some fieldpiece smart probes so I can gauge up and performance test it but was curious if anyone has done this or is my understanding of how the DoD works way off?

  6. #6
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    Get an IAQ thermostat, it can slow the blower whether in first or second stage cooling.
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    Quote Originally Posted by beenthere View Post
    Get an IAQ thermostat, it can slow the blower whether in first or second stage cooling.
    That’s what I have it connected to but your saying that it will slow the blower in either 1st or 2nd stage with Y2 off the tstat hooked to BK?

  8. #8
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    IAQ should have U terminals. Connect to them, and set it up to slow the blower when RH is above set point.
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  9. #9
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    There in lies some of my confusion as it appears the tstat instructions says hook Ylo to the Universal relay for DoD on low, yet the unit instructions says cut the R to BK jumper and connect Y2 to the BK wire. Will either way slow the blower in Ylo or do I need to do both?

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    R to BK must be cut either way.

    Connect stat Y/lo to units Y/LO, and the thermostats universal terminal to the BK. That way it slows the blower when ever the humidity is above set point. Plus you can disable comfortr then.
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  11. #11
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    Thanks Beenthere! That makes more operational sense than anything I gathered from local trane tech support or Honeywell.

  12. #12
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    Quote Originally Posted by Makeitcold View Post
    Has anyone attempted hooking the first stage cooling up to the bk wire and seeing what happens when humidity setpoint is surpassed? Feel free to elaborate
    where does said black wire go? umm way more info needed

  13. #13
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    Not the black wire. BK wire on a Trane and maybe others is a wire designation for control of the VS blower

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